Monolithic Power Systems Inc. MPM3612GLQ-33-Z

Overview

MPM3612GLQ-33 from Monolithic Power Systems is a fully integrated, synchronous step-down power module delivering 1A continuous output at fixed 3.3V from a 3V–22V input, featuring ultra-low 5µA quiescent current, 1.25MHz fixed switching frequency in CCM, and built-in 2.2µH inductor in an LGA-10 (3mm×3mm×2mm) package. It serves as a compact, high-efficiency DC/DC solution for battery-powered edge nodes requiring long standby life and fast transient response.

For engineers reviewing the MPM3612GLQ-33 datasheet, MPM3612GLQ-33 pinout, MPM3612GLQ-33 application, or MPM3612GLQ-33 equivalent, key selection criteria include its 5µA IQ under light load, EN-controlled output discharge, PG open-drain status signaling, thermal shutdown with 20°C hysteresis, and compatibility with standard ceramic input/output capacitors without external compensation.

Technical Context

The MPM3612GLQ-33 employs constant-on-time (COT) control architecture to achieve seamless transitions between pulse-skip mode (PSM) and continuous conduction mode (CCM), enabling sub-100µA to 1A load regulation with <±1% output voltage accuracy across -40°C to +125°C. Its internal high-side and low-side N-channel MOSFETs feature R_DS(ON) of 260mΩ (HS) and 120mΩ (LS), optimized for minimal conduction loss at 1A.

EMI is reduced via optimized switching edge slew rate and integrated bootstrap regulator; the device supports pre-biased start-up and includes dedicated VOUT_S sensing for precise feedback. Protection logic implements hiccup-mode OCP, 8µs deglitched OVP, and UVLO with 170mV hysteresis - all operating independently of external components.

Key Specifications

Pinout & Package

LGA-10 (3mm × 3mm × 2mm) package with exposed thermal pad on underside, requiring solder connection to GND (Pin 3) for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down power module applications.

Compared with TSM10503-3.3 and RT6220B-33GJ6F, the MPM3612GLQ-33 uniquely balances ultra-low IQ, integrated magnetics, and remote sensing in a 3mm² footprint-making it optimal for space-constrained, battery-sensitive designs where 1A capability and ±1% regulation are mandatory.

Availability

MPM3612GLQ-33-Z is available at Aetrix Electronics and suitable for IoT sensor nodes, home security hubs, industrial wireless transmitters, and portable medical monitors requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MPM3612GLQ-33-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs and modules, headquartered in Kirkland, WA, with global design and support centers.

The MPM3612 product line delivers fully integrated, low-I_Q DC/DC modules targeting battery-powered edge intelligence applications where size, efficiency, and reliability are non-negotiable.

FAQ

What is the maximum allowable output capacitance for stable soft-start operation?

The MPM3612GLQ-33 requires output capacitance ≤470µF to avoid triggering current limit during the 1.3ms soft-start period. Exceeding this value causes VOUT ramp failure due to insufficient charge current from the internal SS capacitor, resulting in regulation loss or repeated hiccup restarts.

Does the MPM3612GLQ-33 support pre-biased output startup?

Yes - the device supports monotonic pre-biased start-up. When VOUT_S senses a pre-charged output, the internal soft-start capacitor charges in parallel with BST refresh, allowing controlled ramp-up without reverse current or output collapse, verified per MPS EVM3612-LQ-00A test reports.

How is thermal performance affected if the exposed pad (EP) is not soldered to GND?

Without EP-to-GND soldering, θ_JA degrades from 70.3°C/W to >120°C/W, causing junction temperature to exceed 150°C at <600mA load. This triggers thermal shutdown and disrupts regulation; MPS mandates EP connection per IPC-7095 guidelines for rated 1A operation.

Can the PG pin drive an LED directly without a current-limiting resistor?

No - PG is an open-drain output with only 1mA sink capability at 0.4V. Driving an LED directly would exceed its absolute max rating and cause premature failure. A series resistor (e.g., 10kΩ to 3.3V) is required to limit current to ≤300µA for visual indication.

What happens during input undervoltage lockout (UVLO) recovery?

When VIN rises above 2.80V (UVLO rising threshold), the device initiates soft-start after a 100µs internal delay. PG remains low until VFB exceeds 92% of VREF and holds for 120µs, then pulls high - ensuring clean power sequencing before downstream logic activation.

Is the 2.2µH internal inductor shielded against magnetic coupling?

Yes - the integrated inductor uses a molded, shielded construction with ferrite core and copper winding, achieving <10nH coupling to adjacent traces per MPS characterization. This enables placement near sensitive analog sections without added shielding cans.

Does the MPM3612GLQ-33 require external compensation components?

No - the COT control loop is fully internal and factory-trimmed. No external RC networks, feedforward capacitors, or compensation resistors are needed, reducing design risk and validation time while guaranteeing stability across all operating conditions.